| 词条 | Narthecoceratidae |
| 释义 |
| name = Narthecoceratidae | fossil_range = Ordovician | image = | image_caption = | regnum = Animalia | phylum = Mollusca | classis = Cephalopoda | subclassis = Orthoceratoidea | ordo = Orthocerida | familia = Narthecoceratidae | familia_authority = | subdivision_ranks = Genera | subdivision = }}Narthecoceratidae is an extinct family of orthocone cephalopods who lived in marine environments in what is now North America during the Ordovician from 460.5—449 mya, existing for approximately {{Mya|460.5-449|million years}}.[1] TaxonomyNarthecoceratidae was named by Flower (1958). It was assigned to Endocerida by Teichert et al. (1964); and reassigned to Orthocerida by Frey (1981).[2][3] MorphologyThe shell is usually long, and may be straight ("orthoconic") or gently curved. In life, these animals may have been similar to the modern squid, except for the long shell. Fossil distributionFossil distribution includes Ohio, Franklin District, Canada, and Manitoba, Canada. References{{Portal|Paleozoic|Paleontology}}1. ^PaleoBiology Database: Narthecoceratidae, basic info {{Taxonbar|from=Q6966411}}2. ^C. Teichert, B. Kummel, W.C. Sweet, H.B. Stenzel, W.M. Furnish, B.F. Glenister, H.K. Erben, R.C. Moore, and D.E. Nodine Zeller. 1964. Cephalopoda - general features - Endoceratoidea - Actinoceratoidea - Nautiloidea - Bactritoidea. Treatise on Invertebrate Paleontology K(3):1-519 3. ^R. C. Frey. 1981. Narthecoceras (Cephalopoda) from the Upper Ordovician (Richmondian) of Southwest Ohio. Journal of Paleontology 55(6):1217-1224 6 : Orthoceroids|Prehistoric cephalopod families|Ordovician molluscs|Paleozoic cephalopods of North America|Darriwilian first appearances|Late Ordovician extinctions |
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